It's great you're looking into the gut-brain connection in autism! Research shows GI issues like constipation and abdominal pain are much more common in autistic individuals and can worsen behaviors and anxiety.

The gut-brain axis, especially serotonin, plays a big role. Studies have even shown that improving gut health through fecal transplants can improve autism symptoms and development, although there can be temporary side effects.

Focusing on dietary diversity and stress reduction may help. Keep track of whether GI improvements correlate with behavioral gains. You can find additional resources on the Autism Society website. I hope this helps!